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arXiv · 2607.22420

Bipartite graphs, random graphs, and Lin--Lu--Yau curvature

Huiqiu Lin·Zhe You·Da Zhao
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Abstract

Let $G = (X, Y; E)$ be a bipartite graph with parts $X$ and $Y$ where $|X|=m$ and $|Y|=n$. We show that every bipartite graph with more than $mn - D(m,n)$ edges has positive Lin--Lu--Yau curvature, where $D(m,n)=m-2+\lceil{\frac {n}{2}\rceil} \text{ if $n\geq 2m$}, \mbox{and} \ n-1 \text{ if $m\leq n< 2m$}.$ We also show that every bipartite graph of order $m+n$ with $m \geq n$ and minimum degree at least $\min\{n, \lfloor{\frac{m+n}{3}\rfloor}+1\}$ has positive Lin--Lu--Yau curvature. Both bounds are sharp. Meanwhile probabilistically we can relax the edge density conditions in above results. It is shown that relatively dense random bipartite graph is positively curved. All of our proofs are based on a new formula for Lin--Lu--Yau curvature of bipartite graphs.

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Huiqiu Lin, Zhe You, Da Zhao. 2026-07-24. Bipartite graphs, random graphs, and Lin--Lu--Yau curvature. https://arxiv.org/abs/2607.22420

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